#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

void solve() {
  ll n;
  cin >> n;
  ll m = n % 2;
  if (n % 2) {
    n--;
  }
  n /= 2;
  rep(i, n) { cout << "ABACBC"; }
  if (m) {
    cout << "ABC";
  }
  cout << '\n';
}

int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  int T = 1;
  cin >> T;
  for (int t = 0; t < T; t++) {
    solve();
  }
  return 0;
}